Sam Atkins 0f9f6aef81 LibWeb: Simplify StyleValue API now that auto isn't a length ...

Now that LengthStyleValue never contains `auto`, IdentifierStyleValue is
the only type that can hold an identifier. This lets us remove a couple
of virtual methods from StyleValue.

I've kept `has_auto()` and `to_identifier()` for convenience, but they
are now simple non-virtual methods.

2023-04-19 18:25:18 +02:00

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